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• UDP : join multicast group on the interface specified with &localaddr=

  13 décembre 2013, par Stoian Ivanov

  UDP : join multicast group on the interface specified with &localaddr=
  When joining multicast groups, ffmpeg was using INADDR_ANY as interface address
  
  which leads to enabling the multicast group on the interface with "default gateway".
  
  Often multicast traffic is received over dedicated interface, which scenario ffmpeg was
  
  unable to handle. With this patch, ffmpeg will enable multicast group to the interfaces
  
  configured with address specified in &localaddr= parameter of udp :// URL. To avoid
  
  loacal_addr resolve at udp_close(...) the UDPContext structure was extended with
  
  struct sockaddr_storage local_addr_storage member, which is populated in udp_open(..)
  
  and passed to udp_join_multicast_group()  and udp_leave_multicast_group().
  Signed-off-by : Stoian Ivanov <s.ivanov@teracomm.bg>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/udp.c

• ffmpeg what is the codec for play video in windows media player and web browser

  27 septembre 2016, par Swagat

  I have a requirement to convert video to mp4 which can play both windows medial player(latest version) and web browser(video tag)

  I got to run video in both windows media player or web browser, but two different video. i.e. in below scenario :

  For windows media play, I am using -codec:v mpeg4 and an example is :

  ffmpeg -i input.mp4  -filter_complex  -codec:v mpeg4 -flags:v +qscale -global_quality:v 0 -codec:a libmp3lame  output.mp4

  For Web Browser I need to run with -codec:v libx264 and an example is :

  ffmpeg -i input.mp4  -filter_complex  -codec:v libx264 -flags:v +qscale -global_quality:v 0 -codec:a copy output.mp4

  Both them are working perfectly in their respective player. Even I tried with combine both codec, its obvious, it is raising error.

  Any way to play in both place. Any way of direction will also help me here.

  Thanks in advance.

• Storing high quality video stream (from IP Action Camera) continuously to a Storage Device and issues around Write-Speed bottlenecks

  21 mai 2017, par Aldo

  I am looking to get an Action Camera (Eken H8R, or a GoPro) for a project. Let me explain the scenario I have :

  I will obtain a live stream from the camera on to a Raspberry Pi (over WiFi) as shown here. Next, I want to continuously segment this live stream into 10-15 minute video clips and store them in an external Hard Drive (which is connected to the RPi). I am considering this thread, and the avconvcommand mentioned in the answer by Alexander.

  Now, my concern is write-speed limitations. The video stream would probably have a high bitrate, and might be 4k30fps, in which case file sizes would be huge. Would write speed to disk be a bottleneck ? If so, how will the Pi maintain a buffer to achieve this ? Could I run out of space as the memory stick on the Pi would only be around 8 gigs ? If so, what’s a better alternative ? Please correct me if I’m wrong on these as I’m only a beginner.